CVE-2026-44713

HIGHPre-NVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.8 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 95% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m, epss
8.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/tmux.c reads the user's $TMUX environment variable, splits it on commas, and interpolates the socket-path component directly into a shell command passed to popen(). Because the value is placed inside double-quotes without sanitisation, any value containing " terminates the quoted string and injects arbitrary shell syntax. popen() runs as root inside the PAM stack. This vulnerability is fixed in 0.8.7.

CVSS v3
8.8
EG Score
8.8(medium)
EPSS
5.3%
KEV
Not listed

Published

May 27, 2026

Last Modified

May 30, 2026

Advisory Details (1)

Auto-updated Jun 2, 2026
Patch available. Sources: github.
github Patch Available

Command injection via $TMUX environment variable leads to RCE as root · Advisory · mcdope/pam_usb · GitHub

https://github.com/mcdope/pam_usb/security/advisories/GHSA-822m-whrh-vrj8

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 109 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  3. 2026-07-13 22:30 UTCEPSS rescore
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  1. 2026-06-28 08:35 UTCEG score recompute
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  75. 2026-06-01 01:19 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-44713?
CVE-2026-44713 is a high vulnerability published on May 27, 2026. pam_usb provides hardware authentication for Linux using ordinary removable media. Prior to 0.8.7, src/tmux.c reads the user's $TMUX environment variable, splits it on commas, and interpolates the socket-path component directly into a shell command passed to popen(). Because the value is placed…
When was CVE-2026-44713 disclosed?
CVE-2026-44713 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on May 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44713 actively exploited?
CVE-2026-44713 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-44713?
CVE-2026-44713 has a CVSS v4.0 base score of 8.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-44713?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44713, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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